244 WHITE WILLOW 



silky or hoary tomentose beneath, the appressed hairs 

 directed forwards. Margins recurved, entire or serratulate, 

 with small distant glandular teeth. Petiole very short, 

 and the stipules minute or obsolete, and seldom seen, but 

 elliptic or linear-lanceolate. The lower leaves may be at 

 length glabrous, and merely glaucous beneath. The apex 

 obtuse or acute, or suddenly acuminate and then generally 

 oblique and spout-like. No stomata on the upper surface. 

 Autumn leaves yellow and brown. 



Venation pinnate-reticulate, the secondaries leaving the 

 midrib at acute angles, prominent beneath, and rapidly 

 breaking up into a close network of tertiaries, all fine, 

 and the ultimate venation therefore obscure. About 5 6 

 secondaries on each side, fairly equidistant. 



Several varieties and hybrids are described, differing 

 in the combination of characters referred to above. 



Leaves longer, 6 --20 x 0*5 2 cm. or more, 

 serratulate or serrate, stipules caducous. 

 Trees or osiers. 



f~~l Leaves linear-lanceolate or linear, 10 

 30 x 0*5 2 cm., margins wrinkled. 

 Osier. 



Salix viminalis sometimes has minute distant teeth, 

 and may then come here. See p. 286. 



O7 Leaves lanceolate, serrate, at most 6 12 

 x 1 2 cm. Tree. 



Salix alba, L. White Willow. Large tree, often 

 pollard, with leaves much like those of S. fragilis, but 

 silvery white beneath, and twigs not brittle at the joints. 

 Leaves broad- to linear-lanceolate, 5 6 times as long as 

 broad, 6 10 x 1 2 cm., broadest at or above the middle ; 

 straight acuminate, finely serratulate, with straight gland- 



